New MCP tool `export_sch_python_bom` wrapping `kicad-cli sch export python-bom`: emits the legacy intermediate XML netlist consumed by the schematic editor's Python BOM scripts. Minimal option set (outputPath + schematicPath only, matching the subcommand's --help). schematicPath required and validated. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>